Middle-infrared band ultrathin slab lens based on meta-material

A flat-panel lens and infrared band technology, applied in the direction of lens, optics, instruments, etc., can solve the problems of focusing lens shape influence, heavy weight, thick lens, etc., achieve the effect of integration and miniaturization, and reduce quality and size

Active Publication Date: 2015-09-09
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a mid-infrared band ultra-thin flat lens based on metamaterials, and to solve the problems of traditional lenses in the field of aerospace imaging, such as large thickness and heavy weight, and the focus being affected by the shape of the lens question

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  • Middle-infrared band ultrathin slab lens based on meta-material

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Embodiment Construction

[0014] Using the electric resonance effect of the V-shaped metal rod structure, the metal micro-nano structure near the resonance area can be regarded as a nano-antenna. Considering that the wavelength of the incident light is much longer than the length of the nanoantenna, the metal nanoantenna can be equivalent to an electric dipole, and the V-shaped metal rod structure naturally has two resonance excitation modes, namely, symmetric mode (Symmetric mode) and antisymmetric mode (Antisymmetric mode). ). Due to the different excitation effects of the incident light in the two directions, the vibrations in the two directions are converted to each other, and a special phase change from the incident polarized (A) wave to the outgoing polarized (B) wave is realized. Among them, A wave and B wave vibration are perpendicular to each other. In the specific calculation, the Maxwell equation and specific boundary conditions are used to calculate the corresponding absorption and radiati...

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Abstract

The invention provides a middle-infrared band ultrathin slab lens based on meta-material. The middle-infrared band ultrathin slab lens comprises a circular barium fluoride slab substrate. V-shaped metal bar structures are etched on the circular barium fluoride slab substrate. A gold film is coated on the V-shaped metal bar structures. On the V-shaped metal bar structures, different phases phi of V-shaped metal bar structures are arranged at positions of different radiuses r. Different V-shaped metal bar structures are arranged along a radial direction so that concentric rings are formed. The V-shaped metal bar structures arranged on each concentric ring are identical. A method of utilizing 16 groups of V-shaped metal bar structures to continuously adjust and control the phase is firstly put forward, and the middle-infrared band slab lens is processed by utilizingcombination of photo-etching and film coating methods. Compared with a conventional convex lens, a conventional curved surface Fourier transform function is substituted by phase adjustment and control through the V-shaped metal bar structures. The lens has ultrathin and slab characteristics so that weight and size are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of micro-nano processing, and relates to a mid-infrared band ultra-thin flat lens based on metamaterials. Background technique [0002] With the rapid development of the aerospace field, aerospace optics technology issues have put forward higher requirements for the integration, miniaturization and high resolution of imaging systems. However, traditional lenses achieve imaging by shaping the shape of the lens to change the optical path difference. As the radius of the lens increases, the requirements for processing become more and more stringent, and the quality of the lens inevitably increases rapidly, which is no longer possible Meet the requirements of integration and miniaturization. On the other hand, traditional imaging is limited by the diffraction limit, and the idea of ​​improving resolution cannot be realized. When the optical properties of natural materials cannot meet the needs, the research on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08G02B27/00
CPCG02B3/08G02B27/0012
Inventor 孙倩阮宁娟王漱明刘辉韩潇吴立民张秉隆曾培王羽中祝世宁
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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